Ridhani, A. . “Occupational Health Services As an Effort to Increase the Health of Workers at PT Petrokimia Gresik During the Covid-19 Pandemic”. Nautical : Jurnal Ilmiah Multidisiplin Indonesia, vol. 1, no. 9, Dec. 2022, pp. 899-05, doi:10.55904/nautical.v1i9.490.